JPH02150544A - Camshaft - Google Patents
CamshaftInfo
- Publication number
- JPH02150544A JPH02150544A JP29448688A JP29448688A JPH02150544A JP H02150544 A JPH02150544 A JP H02150544A JP 29448688 A JP29448688 A JP 29448688A JP 29448688 A JP29448688 A JP 29448688A JP H02150544 A JPH02150544 A JP H02150544A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- cam
- key
- shaft hole
- protrusion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002788 crimping Methods 0.000 claims 1
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005219 brazing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Landscapes
- Gears, Cams (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明はカムシャフトに関する。[Detailed description of the invention] "Industrial application field" The present invention relates to a camshaft.
「従来の技術」
シャフトの外周に、別体のカムを嵌合して製造されるカ
ムシャフトとしては、従来より以下のようなものが公知
である。"Prior Art" The following camshafts are conventionally known, which are manufactured by fitting a separate cam to the outer periphery of the shaft.
■ 軸線方向に延びるキー溝をシャフトの外周に複数形
成するとともに、カムのシャフト孔の内面にはキー突条
を形成し、これらキー溝とキー突条を噛み合わせてシャ
フトにカムを取り付けたうえ、これらの間隙にロウ剤を
充填して固定する。■ A plurality of key grooves extending in the axial direction are formed on the outer circumference of the shaft, and key protrusions are formed on the inner surface of the shaft hole of the cam.These key grooves and key protrusions are engaged to attach the cam to the shaft. , These gaps are filled with wax and fixed.
■ カムのシャフト孔に中空シャフトを通し、カムを位
置決めした後、中空シャフトのカム固定部を膨出させて
カムを固定する。■ Pass the hollow shaft through the shaft hole of the cam, position the cam, and then bulge the cam fixing part of the hollow shaft to fix the cam.
■ 前記■と同様に全てのカムを位置決めした後、中空
シャフトを全長に互って拡管し、全てのカムを同時に固
定する。■ After positioning all the cams in the same manner as in (■) above, expand the hollow shaft to the full length and fix all the cams at the same time.
［発明が解決しようとする課題」
ところが前記■のカムシャフトでは、シャフトのキー溝
とカムのキー突条との相対位置に高い寸法精度が要求さ
れるため、これらキー溝およびキ−突条の形成に手間が
かかり、生産性向上の点で障害となるうえ、多大なコス
トがかかるという欠点があった。[Problem to be Solved by the Invention] However, in the camshaft of item (1) above, high dimensional accuracy is required for the relative position of the keyway of the shaft and the key protrusion of the cam, so the relationship between the keyway and the key protrusion is The disadvantage is that it takes time and effort to form, which is an obstacle to improving productivity, and it also costs a lot of money.
また前記■と■のカムシャフトでは、カム固定作業に手
間がかかり生産コストが高いうえ、カムには恒久的に大
きな応力が加わるので、製造コストの安い焼結体製カム
は耐久性および信頼性の点で使用することが難しく、こ
の点からも生産コストが高くつく問題があった。In addition, with the camshafts described in ■ and ■, the cam fixing work is time-consuming and production costs are high, and the cams are permanently subjected to large stress, so sintered cams, which are cheaper to manufacture, are less durable and reliable. This makes it difficult to use, and this also raises the problem of high production costs.
「課題を解決するための手段」
本発明は上記課題を解決するためになされたもので、外
周面のカム固定箇所に、周方向に延びる溝およびこれら
溝の周囲に盛り上がる突条が形成されたシャフトと、前
記シャフトの本体部より大径でかつ前記突条の外径より
も小径なシャフト孔が形成されるとともに、このシャフ
ト孔の内面には、軸線方向に延びる複数のキー突条が形
成された１以上のカムとから構成され、前記カムのシャ
フト孔にシャフトのカム固定箇所を圧入し、シャフト孔
のキー突条でシャフトの突条にキー溝を形成するととも
に、各突条をシャフト孔の内面に圧着させることにより
、カムが固定されていることを特徴とする。"Means for Solving the Problems" The present invention has been made to solve the above problems, and includes grooves extending in the circumferential direction and protrusions raised around these grooves at the cam fixing locations on the outer circumferential surface. A shaft hole having a diameter larger than the main body of the shaft and smaller than an outer diameter of the protrusion is formed on the inner surface of the shaft hole, and a plurality of key protrusions extending in the axial direction are formed on the inner surface of the shaft hole. The cam fixing part of the shaft is press-fitted into the shaft hole of the cam, and a key groove is formed in the shaft protrusion by the key protrusion of the shaft hole, and each protrusion is attached to the shaft. It is characterized in that the cam is fixed by being crimped onto the inner surface of the hole.
「作用」
このカムシャフトでは、シャフトにカムを圧入するだけ
でカムを任意の角度位置に固定できるため、カムとシャ
フトの位置精度を高めることが容易で、しかもカムのキ
ー突条は自らが形成したキー溝に密着状態で嵌合するか
ら固定力が極めて大きい。また、圧λ後のカムには大き
な応力が加わらないので、コストの安い焼結体製のカム
も高い信頼性を以て使用できる。``Function'' With this camshaft, the cam can be fixed at any angular position simply by press-fitting the cam into the shaft, making it easy to improve the positional accuracy of the cam and shaft.Moreover, the cam's key protrusion is formed by itself. The fixing force is extremely high because it fits tightly into the keyway. In addition, since no large stress is applied to the cam after the pressure λ, a cam made of an inexpensive sintered body can also be used with high reliability.
マタ、シャフトの突条の外径は、圧入前にカムのシャフ
ト孔の内径よりも大きく形成されているため、各突条の
頭頂部はシャフト孔のエツジに削られてシャフト孔の内
面に圧着する。そして、この圧着力が前記キー突条とキ
ー溝との嵌合力に加わる分、カムの固定強度が向上でき
る。Actually, the outer diameter of the protrusions on the shaft is formed to be larger than the inner diameter of the cam shaft hole before press fitting, so the top of each protrusion is shaved by the edge of the shaft hole and crimped to the inner surface of the shaft hole. do. Then, the fixing strength of the cam can be improved by the amount that this pressing force is added to the fitting force between the key protrusion and the key groove.
「実施例」
第１図およびＩＪ２図は本発明に係わるカムシャフトの
一実施例を示す断面図およびト」線視断面図である。Embodiment FIG. 1 and FIG. 2 are a sectional view and a sectional view taken along the line T, showing an embodiment of a camshaft according to the present invention.
図中符号１は中空金属製シャフトで、このシャフト１の
各カム固定箇所ＩＡには、焼結体製カム２（一つのみ図
示）が互いに離間して所定角度で固定されている。Reference numeral 1 in the figure represents a hollow metal shaft, and sintered body cams 2 (only one is shown) are fixed at predetermined angles to each cam fixing location IA of the shaft 1 at a distance from each other.
前記カム固定箇所ＩＡには、第３図に示すように、カム
固定に先立って多数の溝３が螺旋状または同心円状に周
方向に転造され、これにより溝３同士の間隙が盛り上が
り、突条４となっている。As shown in FIG. 3, at the cam fixing point IA, a large number of grooves 3 are rolled in the circumferential direction in a spiral or concentric manner prior to the cam fixation, and as a result, the gaps between the grooves 3 bulge, creating protrusions. Article 4.
これら突条４の外径Ｄ２はシャフト本体ｆＭＩＢの外径
ＤＩの１０１−１１０％程度とされることが望ましい。It is desirable that the outer diameter D2 of these protrusions 4 is approximately 101-110% of the outer diameter DI of the shaft body fMIB.
この範囲より小さいと十分なカム固定強度が得られず、
またこれより大きいと円滑な圧入が困難になりカム２の
位置精度が低下する。If it is smaller than this range, sufficient cam fixing strength will not be obtained.
Moreover, if it is larger than this, smooth press-fitting becomes difficult and the positional accuracy of the cam 2 decreases.
一方、カム２には、シャフト本体部ＩＢの外径ＤＩより
も大きく、突条４の外径Ｄ２より小さい内径Ｄ３を有す
る円柱形のシャフト孔５が軸線方向に形成されている。On the other hand, a cylindrical shaft hole 5 having an inner diameter D3 larger than the outer diameter DI of the shaft body portion IB and smaller than the outer diameter D2 of the protrusion 4 is formed in the cam 2 in the axial direction.
このシャフト孔５の内面には、軸線方向に延びるキー突
条６が周方向等間隔に（この場合は８つ）形成され、各
キー突条６の断面はエツジを有する矩形状とされている
。これらキー突条６の突出量は、その頂点面６Ａでの内
径Ｄ４が次式の関係を満たすようＪこなっている。On the inner surface of the shaft hole 5, key protrusions 6 extending in the axial direction are formed at equal intervals in the circumferential direction (eight in this case), and each key protrusion 6 has a rectangular cross section with an edge. . The amount of protrusion of these key protrusions 6 is J such that the inner diameter D4 at the apex surface 6A satisfies the following relationship.
Ｄ１≦Ｄ４＜Ｄ３＜Ｄ２
一方、突条４の幅や断面形状は、カム２をシャフト１に
圧入する際に、突条４がキー突条６により良好に切削さ
れるように考慮すべきである。D1≦D4<D3<D2 On the other hand, the width and cross-sectional shape of the protrusion 4 should be considered so that the protrusion 4 is well cut by the key protrusion 6 when the cam 2 is press-fitted into the shaft 1. be.
カム２をシャフト１に固定するには、シャフト１の一端
側のカム固定部ＩＡから順に、溝３および突条４の転造
と、カム２の圧入とを交互に繰り返していく。すると、
第３図に示すように、各キー突条６が先端エツジ６Ａで
突条４を順に切り欠いてキー溝７を形成すると同時に、
キー突条６を除くシャフト孔５の前端エツジ５Ａが各突
条４の頭頂部を全長に亙って僅かに切り欠いていく。し
たがって圧入後は、キー突条６は自ら形成したキー溝７
に隙間なく嵌合するうえ、各突条４の頭頂部がシャフト
孔５の内面に圧着され、カムが強固に固定される。なお
、圧入が完了したままの状態でもこのカムシャフトは使
用可能であるが、強度および信頼性をさらに高めるため
に、カム２とシャ７）１との空隙にロウ剤を充填したり
、カム２とシャフト１とをスポット溶接してもよい。To fix the cam 2 to the shaft 1, rolling of the groove 3 and the protrusion 4 and press-fitting of the cam 2 are alternately repeated starting from the cam fixing portion IA at one end of the shaft 1. Then,
As shown in FIG. 3, each key protrusion 6 sequentially cuts out the protrusion 4 at the tip edge 6A to form a key groove 7, and at the same time,
The front end edge 5A of the shaft hole 5 excluding the key protrusion 6 slightly cuts the top of each protrusion 4 over its entire length. Therefore, after press-fitting, the key protrusion 6 is inserted into the key groove 7 formed by itself.
In addition, the top of each protrusion 4 is pressed against the inner surface of the shaft hole 5, and the cam is firmly fixed. Although this camshaft can be used even after press-fitting is completed, in order to further increase the strength and reliability, the gap between the cam 2 and the shaft 7) 1 may be filled with a brazing agent or the cam 2 and the shaft 1 may be spot welded.
上記構成からなるカムシャフトでは、シャフトｌにカム
２を圧入するだけでカム２を任意の角度位置に固定でき
るため、組み立て作業が極めて容易で手間がかからず、
生産性を高め、その分製造コスト低下が図れる。また、
カム２のキー突条６は自らが切り開いたキー溝７に密着
状態で嵌合するから、固定力が極めて大きいうえ、がた
つきが全くなく、高い位置精度が容易に実現できる。さ
らに圧入後のカム２には、従来の圧入型カムシャフトは
どの大応力が加わらないため、低コストで寸法精度の高
い焼結体製のカム２を使用することができ、この点から
も低コスト化および高精度化が図れる。With the camshaft having the above configuration, the cam 2 can be fixed at any angular position simply by press-fitting the cam 2 into the shaft l, so the assembly work is extremely easy and requires no effort.
Productivity can be increased and manufacturing costs can be reduced accordingly. Also,
Since the key protrusion 6 of the cam 2 tightly fits into the key groove 7 cut by itself, the fixing force is extremely large, there is no rattling at all, and high positional accuracy can be easily achieved. Furthermore, since conventional press-fit camshafts do not apply any large stress to the cam 2 after press-fitting, it is possible to use a cam 2 made of a sintered body with low cost and high dimensional accuracy. Cost reduction and high precision can be achieved.
また、この実施例では、シャフト１の突条４の圧入前の
外径Ｄ２がシャフト孔５の内径Ｄ３よりも大きく形成さ
れているため、圧入後は各突条４の切り欠かれた頭頂部
がシャフト孔５の内面に圧着する。したがって、この圧
着力が各キー突条６と各キー溝７との前記嵌合力に加わ
るため、−層大きなカム固定強度が得られる。Further, in this embodiment, the outer diameter D2 of the protruding ridges 4 of the shaft 1 before press-fitting is formed larger than the inner diameter D3 of the shaft hole 5, so that after press-fitting, the notched top of each protruding ridge 4 is pressed against the inner surface of the shaft hole 5. Therefore, since this pressing force is added to the fitting force between each key protrusion 6 and each keyway 7, a much greater cam fixing strength can be obtained.
なお、上記実施例ではキー突条６の断面形状が矩形状で
あったが、これらを３角形状や半円状に変更してもよい
。またシャフト孔５の内径Ｄ３をシャフト圧入方向前方
側（第３図左側）から後方側にかけて漸次縮小させ、シ
ャフト孔５を僅かに窄まるテーパ状とし、シャフト圧入
時にシャフト孔５の前端エツジ５Ａで僅かに切り欠かれ
た突条４の頭頂部を前記テーバ面により圧迫し、圧入後
のカム２に適度な応力をかける構成としてもよい。In the above embodiment, the cross-sectional shape of the key protrusion 6 is rectangular, but it may be changed to a triangular shape or a semicircular shape. In addition, the inner diameter D3 of the shaft hole 5 is gradually reduced from the front side (left side in FIG. 3) to the rear side in the shaft press-fitting direction, and the shaft hole 5 is made into a slightly tapered shape, so that the front end edge 5A of the shaft hole 5 when the shaft is press-fitted. A structure may be adopted in which the slightly notched top of the protruding rim 4 is pressed by the tapered surface to apply an appropriate stress to the cam 2 after being press-fitted.
さらに、突条４の間隔、突条４の断面形状、突条４の突
出量、キー突条６の突出量などは、必要に応じて適宜、
軸方向に変化させてもよい。Furthermore, the interval between the protrusions 4, the cross-sectional shape of the protrusions 4, the amount of protrusion of the protrusions 4, the amount of protrusion of the key protrusions 6, etc. may be adjusted as necessary.
It may also be changed in the axial direction.
「発明の効果」
以上説明したように、本発明に係わるカムシャフトによ
れば、シャフトにカムを圧入するだけでカムを任意の角
度位置に固定できるため、組み立て作業が極めて容易で
手間がかからず、生産性を高め、その分製造コスト低下
が図れる。また、カムのキー突条は自らが切り欠いたキ
ー溝に密着状態で嵌合するから固定力が極めて大きいう
え、がたつきが全くなく、高い位置精度が容易に実現で
きる。さらに、圧入後のカムには大きな応力が加わらな
いため、低コストで寸法精度の高い焼結体製のカムを使
用することができ、この点からも低コスト化および高精
度化が図れる。"Effects of the Invention" As explained above, according to the camshaft of the present invention, the cam can be fixed at any angular position simply by press-fitting the cam onto the shaft, making assembly work extremely easy and time-consuming. First, productivity can be increased and manufacturing costs can be reduced accordingly. In addition, since the key protrusion of the cam tightly fits into the key groove cut out by itself, the fixing force is extremely large, and there is no wobbling at all, making it easy to achieve high positional accuracy. Furthermore, since no large stress is applied to the cam after press-fitting, it is possible to use a cam made of a sintered body at low cost and with high dimensional accuracy, and from this point of view as well, cost reduction and high precision can be achieved.
また、このカムシャフトは、シャフトの突条の圧入前の
外径がシャフト孔の内径よりも大きいため、圧入時には
キー突条を除くシャフト孔のエツジが突条の頭頂部を全
長に互って僅かに切り欠き、各突条の頭頂部がシャフト
孔の内面に圧着する。In addition, with this camshaft, the outer diameter of the shaft protrusion before press-fitting is larger than the inner diameter of the shaft hole, so when press-fitting, the edges of the shaft hole, excluding the key protrusion, overlap the top of the protrusion over the entire length. There is a slight notch, and the top of each protrusion is pressed against the inner surface of the shaft hole.
したがって、この圧着力がキー突条とキー溝との嵌合力
に加わり、これらの相乗効果により極めて大きなカム固
定強度が得られる。Therefore, this pressure bonding force is added to the fitting force between the key protrusion and the keyway, and the synergistic effect of these forces provides extremely high cam fixing strength.
第１図および第２図は本発明に係わるカムシャフトの断
面図および■−■線視線面断面図３図は同カムシャフト
の製造工程を示す第２図と同じ断面図である。
ｌ・・・シャフト、 ＩＡ・・・カム固定箇所、ＩＢ
・・・本体部、 ２・・・焼結体製カム、３・・・溝、
４・・・シャフトの突条、５・・・シャフト孔
、６・・・キー突条、７・・・キー溝、
ＤＩ・・・シャフト本体部の外径、
Ｄ２・・・シャフトの突条の外径、
Ｄ３・・・シャフト孔の内径、
Ｄ４・・・キー突条の頭頂部での内径。1 and 2 are cross-sectional views of a camshaft according to the present invention, and FIG. 3 is the same cross-sectional view as FIG. 2 showing the manufacturing process of the camshaft. l...shaft, IA...cam fixing point, IB
...Body part, 2...Sintered body cam, 3...Groove,
4...Shaft protrusion, 5...Shaft hole, 6...Key protrusion, 7...Keyway, DI...Outer diameter of shaft body, D2...Shaft protrusion D3: Inner diameter of shaft hole, D4: Inner diameter at top of key protrusion.
Claims (1)
ら溝の周囲に盛り上がる突条が形成されたシャフトと、 前記シャフトの本体部より大径でかつ前記突条の外径よ
りも小径なシャフト孔が形成されるとともに、このシャ
フト孔の内面には、軸線方向に延びる複数のキー突条が
形成された１以上のカムとから構成され、 前記カムのシャフト孔にシャフトのカム固定箇所を圧入
し、シャフト孔のキー突条でシャフトの突条にキー溝を
形成するとともに、各突条をシャフト孔の内面に圧着さ
せることにより、カムが固定されていることを特徴とす
るカムシャフト。[Scope of Claims] A shaft having grooves extending in the circumferential direction and protrusions raised around these grooves formed at a cam fixing location on the outer circumferential surface, and a shaft having a diameter larger than the main body of the shaft and outside the protrusions. A shaft hole having a smaller diameter than the diameter of the shaft is formed, and one or more cams are formed on the inner surface of the shaft hole with a plurality of key protrusions extending in the axial direction, and a shaft is inserted into the shaft hole of the cam. The cam is fixed by press-fitting the cam fixing point, forming a key groove on the shaft protrusion with the key protrusion of the shaft hole, and crimping each protrusion to the inner surface of the shaft hole. camshaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29448688A JPH02150544A (en) | 1988-11-21 | 1988-11-21 | Camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29448688A JPH02150544A (en) | 1988-11-21 | 1988-11-21 | Camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02150544A true JPH02150544A (en) | 1990-06-08 |
Family
ID=17808389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29448688A Pending JPH02150544A (en) | 1988-11-21 | 1988-11-21 | Camshaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02150544A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06280846A (en) * | 1993-02-25 | 1994-10-07 | Sanwa Niidorubearingu Kk | Microshaft and outside press-fitting method for component to microshaft |
| WO2004079163A1 (en) * | 2003-03-08 | 2004-09-16 | Thyssenkrupp Presta Ag | Camshaft with pressed cams |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63297707A (en) * | 1987-05-22 | 1988-12-05 | エタブリスメント・スーパーヴィス | Camshaft and manufacture thereof |
-
1988
- 1988-11-21 JP JP29448688A patent/JPH02150544A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63297707A (en) * | 1987-05-22 | 1988-12-05 | エタブリスメント・スーパーヴィス | Camshaft and manufacture thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06280846A (en) * | 1993-02-25 | 1994-10-07 | Sanwa Niidorubearingu Kk | Microshaft and outside press-fitting method for component to microshaft |
| WO2004079163A1 (en) * | 2003-03-08 | 2004-09-16 | Thyssenkrupp Presta Ag | Camshaft with pressed cams |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2780980B2 (en) | Camshaft manufacturing method and camshaft | |
| EP0650550B1 (en) | Camshaft and method of making a camshaft | |
| JPH0557453B2 (en) | ||
| JP2002345212A (en) | Cylindrical commutator and method of making it | |
| EP0306631A2 (en) | Metal plate laminated body | |
| JP3189058B2 (en) | Mechanical element obtained by press-fitting a shaft into a fitting member and method for manufacturing the same | |
| JPH02150544A (en) | Camshaft | |
| JP2747537B2 (en) | Camshaft | |
| JPH05172209A (en) | Cam shaft | |
| JPH08105307A (en) | Cam shaft for press-fitting parts thereon | |
| JPH01303333A (en) | Unequal pitch eccentric spiral spring and formation therefor | |
| JPH02150543A (en) | Camshaft | |
| JP3270006B2 (en) | End pipe closing and processing method of hollow pipe | |
| JPH0524822Y2 (en) | ||
| JPH08210110A (en) | Manufacture of assembled camshaft | |
| JP3387938B2 (en) | Camshaft | |
| JPH05172211A (en) | Cam shaft | |
| JPH07174212A (en) | Cam shaft | |
| JPH07190172A (en) | Cam shaft | |
| US20020194723A1 (en) | Method for producing a tape | |
| JPH10103329A (en) | Member having fitting-in part and manufacture thereof and mounting method therefor | |
| JPH04365907A (en) | Manufacture for cam shaft | |
| JP3873704B2 (en) | Cam peace | |
| JPH0344799Y2 (en) | ||
| JPH05172210A (en) | Cam shaft |